1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright (c) 2017 - 2019, Intel Corporation.
7 #ifndef __MPTCP_PROTOCOL_H
8 #define __MPTCP_PROTOCOL_H
10 #include <linux/random.h>
12 #include <net/inet_connection_sock.h>
14 #define MPTCP_SUPPORTED_VERSION 1
16 /* MPTCP option bits */
17 #define OPTION_MPTCP_MPC_SYN BIT(0)
18 #define OPTION_MPTCP_MPC_SYNACK BIT(1)
19 #define OPTION_MPTCP_MPC_ACK BIT(2)
20 #define OPTION_MPTCP_MPJ_SYN BIT(3)
21 #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
22 #define OPTION_MPTCP_MPJ_ACK BIT(5)
23 #define OPTION_MPTCP_ADD_ADDR BIT(6)
24 #define OPTION_MPTCP_ADD_ADDR6 BIT(7)
25 #define OPTION_MPTCP_RM_ADDR BIT(8)
26 #define OPTION_MPTCP_FASTCLOSE BIT(9)
27 #define OPTION_MPTCP_PRIO BIT(10)
29 /* MPTCP option subtypes */
30 #define MPTCPOPT_MP_CAPABLE 0
31 #define MPTCPOPT_MP_JOIN 1
32 #define MPTCPOPT_DSS 2
33 #define MPTCPOPT_ADD_ADDR 3
34 #define MPTCPOPT_RM_ADDR 4
35 #define MPTCPOPT_MP_PRIO 5
36 #define MPTCPOPT_MP_FAIL 6
37 #define MPTCPOPT_MP_FASTCLOSE 7
39 /* MPTCP suboption lengths */
40 #define TCPOLEN_MPTCP_MPC_SYN 4
41 #define TCPOLEN_MPTCP_MPC_SYNACK 12
42 #define TCPOLEN_MPTCP_MPC_ACK 20
43 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
44 #define TCPOLEN_MPTCP_MPJ_SYN 12
45 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
46 #define TCPOLEN_MPTCP_MPJ_ACK 24
47 #define TCPOLEN_MPTCP_DSS_BASE 4
48 #define TCPOLEN_MPTCP_DSS_ACK32 4
49 #define TCPOLEN_MPTCP_DSS_ACK64 8
50 #define TCPOLEN_MPTCP_DSS_MAP32 10
51 #define TCPOLEN_MPTCP_DSS_MAP64 14
52 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
53 #define TCPOLEN_MPTCP_ADD_ADDR 16
54 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 20
55 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
56 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12
57 #define TCPOLEN_MPTCP_ADD_ADDR6 28
58 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32
59 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
60 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
61 #define TCPOLEN_MPTCP_PORT_LEN 4
62 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4
63 #define TCPOLEN_MPTCP_PRIO 3
64 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
65 #define TCPOLEN_MPTCP_FASTCLOSE 12
67 /* MPTCP MP_JOIN flags */
68 #define MPTCPOPT_BACKUP BIT(0)
69 #define MPTCPOPT_HMAC_LEN 20
70 #define MPTCPOPT_THMAC_LEN 8
72 /* MPTCP MP_CAPABLE flags */
73 #define MPTCP_VERSION_MASK (0x0F)
74 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
75 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
76 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
77 #define MPTCP_CAP_FLAG_MASK (0x3F)
80 #define MPTCP_DSS_DATA_FIN BIT(4)
81 #define MPTCP_DSS_DSN64 BIT(3)
82 #define MPTCP_DSS_HAS_MAP BIT(2)
83 #define MPTCP_DSS_ACK64 BIT(1)
84 #define MPTCP_DSS_HAS_ACK BIT(0)
85 #define MPTCP_DSS_FLAG_MASK (0x1F)
87 /* MPTCP ADD_ADDR flags */
88 #define MPTCP_ADDR_ECHO BIT(0)
89 #define MPTCP_ADDR_IPVERSION_4 4
90 #define MPTCP_ADDR_IPVERSION_6 6
92 /* MPTCP MP_PRIO flags */
93 #define MPTCP_PRIO_BKUP BIT(0)
95 /* MPTCP socket flags */
96 #define MPTCP_DATA_READY 0
97 #define MPTCP_NOSPACE 1
98 #define MPTCP_WORK_RTX 2
99 #define MPTCP_WORK_EOF 3
100 #define MPTCP_FALLBACK_DONE 4
101 #define MPTCP_WORK_CLOSE_SUBFLOW 5
102 #define MPTCP_PUSH_PENDING 6
103 #define MPTCP_CLEAN_UNA 7
105 static inline bool before64(__u64 seq1, __u64 seq2)
107 return (__s64)(seq1 - seq2) < 0;
110 #define after64(seq2, seq1) before64(seq1, seq2)
112 struct mptcp_options_received {
132 u8 hmac[MPTCPOPT_HMAC_LEN];
145 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
146 struct in6_addr addr6;
153 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
155 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
156 ((nib & 0xF) << 8) | field);
159 struct mptcp_addr_info {
167 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
168 struct in6_addr addr6;
173 enum mptcp_pm_status {
174 MPTCP_PM_ADD_ADDR_RECEIVED,
175 MPTCP_PM_ADD_ADDR_SEND_ACK,
176 MPTCP_PM_RM_ADDR_RECEIVED,
177 MPTCP_PM_ESTABLISHED,
178 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
179 MPTCP_PM_SUBFLOW_ESTABLISHED,
182 enum mptcp_addr_signal_status {
183 MPTCP_ADD_ADDR_SIGNAL,
187 MPTCP_RM_ADDR_SIGNAL,
190 struct mptcp_pm_data {
191 struct mptcp_addr_info local;
192 struct mptcp_addr_info remote;
193 struct list_head anno_list;
195 spinlock_t lock; /*protects the whole PM data */
202 u8 add_addr_signaled;
203 u8 add_addr_accepted;
206 u8 add_addr_signal_max;
207 u8 add_addr_accept_max;
214 struct mptcp_data_frag {
215 struct list_head list;
224 /* MPTCP connection sock */
226 /* inet_connection_sock must be the first member */
227 struct inet_connection_sock sk;
234 u64 rcv_data_fin_seq;
236 struct sock *last_snd;
241 unsigned long timer_ival;
247 bool fully_established;
249 bool snd_data_fin_enable;
251 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
252 spinlock_t join_list_lock;
253 struct sock *ack_hint;
254 struct work_struct work;
255 struct sk_buff *ooo_last_skb;
256 struct rb_root out_of_order_queue;
257 struct sk_buff_head receive_queue;
258 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */
261 struct list_head conn_list;
262 struct list_head rtx_queue;
263 struct mptcp_data_frag *first_pending;
264 struct list_head join_list;
265 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
267 struct mptcp_pm_data pm;
269 u32 space; /* bytes copied in last measurement window */
270 u32 copied; /* bytes copied in this measurement window */
271 u64 time; /* start time of measurement window */
272 u64 rtt_us; /* last maximum rtt of subflows */
276 #define mptcp_lock_sock(___sk, cb) do { \
277 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
279 spin_lock_bh(&__sk->sk_lock.slock); \
280 if (__sk->sk_lock.owned) \
283 __sk->sk_lock.owned = 1; \
284 spin_unlock(&__sk->sk_lock.slock); \
285 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
289 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
290 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
292 #define mptcp_for_each_subflow(__msk, __subflow) \
293 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
295 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
297 return (struct mptcp_sock *)sk;
300 static inline int __mptcp_space(const struct sock *sk)
302 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending);
305 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
307 const struct mptcp_sock *msk = mptcp_sk(sk);
309 return READ_ONCE(msk->first_pending);
312 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
314 struct mptcp_sock *msk = mptcp_sk(sk);
315 struct mptcp_data_frag *cur;
317 cur = msk->first_pending;
318 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
319 list_next_entry(cur, list);
322 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
324 struct mptcp_sock *msk = mptcp_sk(sk);
326 if (!msk->first_pending)
329 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
332 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
335 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
337 struct mptcp_sock *msk = mptcp_sk(sk);
339 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una)))
342 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
345 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
347 struct mptcp_sock *msk = mptcp_sk(sk);
349 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
352 struct mptcp_subflow_request_sock {
353 struct tcp_request_sock sk;
366 struct mptcp_sock *msk;
367 struct hlist_nulls_node token_node;
370 static inline struct mptcp_subflow_request_sock *
371 mptcp_subflow_rsk(const struct request_sock *rsk)
373 return (struct mptcp_subflow_request_sock *)rsk;
376 enum mptcp_data_avail {
377 MPTCP_SUBFLOW_NODATA,
378 MPTCP_SUBFLOW_DATA_AVAIL,
379 MPTCP_SUBFLOW_OOO_DATA
382 struct mptcp_delegated_action {
383 struct napi_struct napi;
384 struct list_head head;
387 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
389 #define MPTCP_DELEGATE_SEND 0
391 /* MPTCP subflow context */
392 struct mptcp_subflow_context {
393 struct list_head node;/* conn_list of subflows */
404 u32 request_mptcp : 1, /* send MP_CAPABLE */
405 request_join : 1, /* send MP_JOIN */
407 mp_capable : 1, /* remote is MPTCP capable */
408 mp_join : 1, /* remote is JOINing */
409 fully_established : 1, /* path validated */
410 pm_notified : 1, /* PM hook called for established status */
417 can_ack : 1, /* only after processing the remote a key */
418 disposable : 1; /* ctx can be free at ulp release time */
419 enum mptcp_data_avail data_avail;
424 u8 hmac[MPTCPOPT_HMAC_LEN];
428 long delegated_status;
429 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
431 struct sock *tcp_sock; /* tcp sk backpointer */
432 struct sock *conn; /* parent mptcp_sock */
433 const struct inet_connection_sock_af_ops *icsk_af_ops;
434 void (*tcp_data_ready)(struct sock *sk);
435 void (*tcp_state_change)(struct sock *sk);
436 void (*tcp_write_space)(struct sock *sk);
441 static inline struct mptcp_subflow_context *
442 mptcp_subflow_ctx(const struct sock *sk)
444 struct inet_connection_sock *icsk = inet_csk(sk);
446 /* Use RCU on icsk_ulp_data only for sock diag code */
447 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
450 static inline struct sock *
451 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
453 return subflow->tcp_sock;
457 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
459 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
460 subflow->ssn_offset -
461 subflow->map_subflow_seq;
465 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
467 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
470 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
471 struct mptcp_subflow_context *subflow)
473 sock_hold(mptcp_subflow_tcp_sock(subflow));
474 spin_lock_bh(&msk->join_list_lock);
475 list_add_tail(&subflow->node, &msk->join_list);
476 spin_unlock_bh(&msk->join_list_lock);
479 void mptcp_subflow_process_delegated(struct sock *ssk);
481 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
483 struct mptcp_delegated_action *delegated;
486 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
487 * ensures the below list check sees list updates done prior to status
490 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
491 /* still on delegated list from previous scheduling */
492 if (!list_empty(&subflow->delegated_node))
495 /* the caller held the subflow bh socket lock */
496 lockdep_assert_in_softirq();
498 delegated = this_cpu_ptr(&mptcp_delegated_actions);
499 schedule = list_empty(&delegated->head);
500 list_add_tail(&subflow->delegated_node, &delegated->head);
501 sock_hold(mptcp_subflow_tcp_sock(subflow));
503 napi_schedule(&delegated->napi);
507 static inline struct mptcp_subflow_context *
508 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
510 struct mptcp_subflow_context *ret;
512 if (list_empty(&delegated->head))
515 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
516 list_del_init(&ret->delegated_node);
520 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
522 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
525 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
527 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
528 * touching the status bit
531 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
534 int mptcp_is_enabled(struct net *net);
535 unsigned int mptcp_get_add_addr_timeout(struct net *net);
536 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
537 struct mptcp_options_received *mp_opt);
538 bool mptcp_subflow_data_available(struct sock *sk);
539 void __init mptcp_subflow_init(void);
540 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
541 void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
542 struct mptcp_subflow_context *subflow);
543 void mptcp_subflow_reset(struct sock *ssk);
544 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
546 /* called with sk socket lock held */
547 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
548 const struct mptcp_addr_info *remote);
549 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
551 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
552 struct mptcp_subflow_context *ctx)
554 sk->sk_data_ready = ctx->tcp_data_ready;
555 sk->sk_state_change = ctx->tcp_state_change;
556 sk->sk_write_space = ctx->tcp_write_space;
558 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
561 void __init mptcp_proto_init(void);
562 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
563 int __init mptcp_proto_v6_init(void);
566 struct sock *mptcp_sk_clone(const struct sock *sk,
567 const struct mptcp_options_received *mp_opt,
568 struct request_sock *req);
569 void mptcp_get_options(const struct sk_buff *skb,
570 struct mptcp_options_received *mp_opt);
572 void mptcp_finish_connect(struct sock *sk);
573 static inline bool mptcp_is_fully_established(struct sock *sk)
575 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
576 READ_ONCE(mptcp_sk(sk)->fully_established);
578 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
579 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
580 bool mptcp_finish_join(struct sock *sk);
581 bool mptcp_schedule_work(struct sock *sk);
582 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
583 void __mptcp_data_acked(struct sock *sk);
584 void mptcp_subflow_eof(struct sock *sk);
585 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
586 void __mptcp_flush_join_list(struct mptcp_sock *msk);
587 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
589 return READ_ONCE(msk->snd_data_fin_enable) &&
590 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
593 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
595 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
598 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
602 static inline void mptcp_write_space(struct sock *sk)
604 if (sk_stream_is_writeable(sk)) {
605 /* pairs with memory barrier in mptcp_poll */
607 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
608 sk_stream_write_space(sk);
612 void mptcp_destroy_common(struct mptcp_sock *msk);
614 void __init mptcp_token_init(void);
615 static inline void mptcp_token_init_request(struct request_sock *req)
617 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
620 int mptcp_token_new_request(struct request_sock *req);
621 void mptcp_token_destroy_request(struct request_sock *req);
622 int mptcp_token_new_connect(struct sock *sk);
623 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
624 struct mptcp_sock *msk);
625 bool mptcp_token_exists(u32 token);
626 struct mptcp_sock *mptcp_token_get_sock(u32 token);
627 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
629 void mptcp_token_destroy(struct mptcp_sock *msk);
631 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
633 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
635 void __init mptcp_pm_init(void);
636 void mptcp_pm_data_init(struct mptcp_sock *msk);
637 void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
638 void mptcp_pm_fully_established(struct mptcp_sock *msk);
639 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
640 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
641 void mptcp_pm_subflow_established(struct mptcp_sock *msk,
642 struct mptcp_subflow_context *subflow);
643 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
644 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
645 const struct mptcp_addr_info *addr);
646 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
647 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
648 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
649 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
650 struct mptcp_addr_info *addr,
652 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
653 struct mptcp_pm_add_entry *
654 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
655 struct mptcp_addr_info *addr);
657 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
658 const struct mptcp_addr_info *addr,
659 bool echo, bool port);
660 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
661 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
663 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
665 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
668 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
670 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
673 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
675 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
678 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
680 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
683 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
685 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
688 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
690 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
692 if (family == AF_INET6)
693 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
695 len += MPTCPOPT_THMAC_LEN;
697 len += TCPOLEN_MPTCP_PORT_LEN;
702 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
703 struct mptcp_addr_info *saddr, bool *echo, bool *port);
704 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
706 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
708 void __init mptcp_pm_nl_init(void);
709 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
710 void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
711 void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
712 void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
713 void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk);
714 void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
715 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
716 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
718 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
720 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
723 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
725 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
727 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
730 static inline bool mptcp_check_fallback(const struct sock *sk)
732 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
733 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
735 return __mptcp_check_fallback(msk);
738 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
740 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
741 pr_debug("TCP fallback already done (msk=%p)", msk);
744 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
747 static inline void mptcp_do_fallback(struct sock *sk)
749 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
750 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
752 __mptcp_do_fallback(msk);
755 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
757 static inline bool subflow_simultaneous_connect(struct sock *sk)
759 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
760 struct sock *parent = subflow->conn;
762 return sk->sk_state == TCP_ESTABLISHED &&
763 !mptcp_sk(parent)->pm.server_side &&
764 !subflow->conn_finished;
767 #ifdef CONFIG_SYN_COOKIES
768 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
769 struct sk_buff *skb);
770 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
771 struct sk_buff *skb);
772 void __init mptcp_join_cookie_init(void);
775 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
776 struct sk_buff *skb) {}
778 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
784 static inline void mptcp_join_cookie_init(void) {}
787 #endif /* __MPTCP_PROTOCOL_H */